Bobbin boring machine



Nov. 29, 1932. M. w. HAMBLETON ET AL 1,389,034

B OBBIN BORING MACHINE Filed Dec. 1, 1928 4 Sheets-Sheet 2 A TTORNEY.

Nov. 29, 1932- M. WuHAMBLETON ET AL 1,389,034

BOBBIN BORING MACHINE Filed De. 1, 1928 4 Sheets-Sheet 5 INVENTORY M145 4 Nov. 29, 1932. M. w. HAMBLETON ET AL 1,889,034

BOBBIN BORING MACHINE F iled' Dec. 1, 1928 4 Sheets-Sheet 4 INVENTORS Patented Nov. 29, 1932 eerie MAURICE XV. I-IAIVEBLETON, OF GOFFSTOWN, AITID BYRQN E. I lURRIL L, 0E NASIIUA, NEW HAMPSHIRE; ESAID MOBRILL ASSIGNOR T0 HAMBLEION BOBBEN BORING ll'IACHINE Application filed December 1, 18-28.

This invention relates to machines wherein a gang or set of tools like bits, drills, or reamers, are arranged to operate on blanks of any material but particularly of wood and more specifically upon blanks which are to become bobbins. Ordinarily it seems necessary or advisable that such blanks should be successively presented to the various tools for their particular action or that the tools should be presented to the blanks.

In the boring of bobbin blanks, it is generally necessary to have bores of several different diameters with one or more tapered portions and such bores are frequently of small diameter with reference to their length. To bore such blanks, several tools, such as bits or reemers, oi gradually increasing lengths and 'uently of successively reduced diameters. are used.

The boring or blanks used for bobbins in textile mills must be performed with the greatest precision. It is the most important operation in their manufacture and unless done accurate y the bobbin must be discarded. V /hen used in the mills, these bobbins revolve on spindles, at approximately 8,000 B. P. M. and when they run out of true, or out of balance, wear out the spindle bolstersor bearings, cause breakage of the thread or yarn and produce yarn of uneven diameter or gauge.

The mills are now adopting longer bobbins which will hold more yarn or filling. These longer bobbins must run true on'the same spindles formely used for shorter bobbins and as the difliculty in making bobbins run true increases with the length of the bobbins, due to the so called overhang of the bobbins, above the top of the spindle, the matter of true boring has become of paramount importance. I

in a machine of this character, it is necessary to combine great speed with accurate boring and to avoid heating the tools.

To accomplish this purpose, it is necessary that the feeding and discharging operations should be quickly and accurately performed, and it is particularly necessary that the chips should not clog up the bore. We are aware that there are machines in which the boring Serial No. 323,121.

tools are arranged with their axes horizontal in which such tools revolve each on its own axis and wherein the blanks are fed around, step by step, the bits being advanced While still revolving into the blanks while the latter are stationary.

There are machines in which the blanks are carried around on a vertical axis step by steo and are raised and lowered between the steps on to revolving bits or tools.

Such a machine is shown in a patent to Farnum No. 1,03%,005, July 80, 1912.

One advantage of revolving the blanks, especially if the set of blanks does not move towards the bits, is that cutting devices can easily be arranged for cutting or turning the whole or part of the outer surface of the blank in such manner as may be desired.

Another advantage of moving the tools toward the blanks rather than the blanks toward the tools is that it makes it much easier to feed and discharge the blanks either by hand or by automatic machinery.

Bobbin borin machines must be of the quantity production type and very accurate.

It has been established that a speed of approximately 5,000 B. P. M. is necessary to permit boring on a production basis.

Therefore in machines with blanks revoluble and bits nonrevoluble, the blanks must rotate at a speed oi approximately 5,000 B. P. M. As the blanks are in the rough stage, they are of uneven diameter, unsymmetrical and more or less warped longitudinaliy and often do terperi'ectly in the chucks. Any of these conditions cause the rotating blank to set up a vibration which heats and wears the bearings and generates frictional heat in the tools due to the stress in the blank caused by running out of balance.

It is therefore important to reduce the speed of the blanks to a point lower than practicable where only the blanks revolve.

Moreover when bits are nonrevoluble, the bits due to their slender nature may become slightly bent or distorted and such condition tends to cause the bit to bore a hole larger than its diameter, which each succeeding bit of uniform diam ter will not fit closely, and the result is a crooked hole.

Likewise in machines including the Farnum with bits revoluble and blanks nonrevoluble, the bits must rotate at a speed of approximately 5,000 B. P. M.

In the case of long slender fluted or spiral bits, this great speed causes them to vibrate, or whip and run out of true at the top, just where they should run true. This causes imperfect centering of the bit and blank and starts a hole out of true, and succeeding bits lit and follow the hole which is already started crooked. When the blanks are sta tionary, the slender bits always tend to follow the grain of the wood and the result is a crooked hole.

Vibration of the bits at great speed also causes crystallization and much breakage of tools.

This invention is of a multiple bit-blank boring machine in which a magazine carrying a series of the blanks moves step by step in a given path preferably circular and in which each blank revolves on its own axis but in which the blanks do not move axially, in combination with a set of co -operating bits or tools each of which does revolve and of which the set moves axially towards and from the blanks in line with their axes.

The advantage of this construction is that by revolving each blank in one direction and each corresponding-tool in the opposite direction, instead of speeding up each to the danger point, the speed of each can be cut in half to accomplish the same result.

In this machine, the same cutting speed 5,000 B. P. M. can be obtained by running both blanks and bits at a speed of 2,500 B. P. M. each, half of the former speed.

Further by revolving both blanks and bits at 3,500 B. l M. each a combined cutting speed of 7,000 B. P. M. can be obtained, 40% more than in any other class of machines, without undue vibration of blanks or bits.

With both blanks and bits revolving, any unevenness of grain texture in the wooden blank is successively revolved around and evenly presented to the cutting edge of the bit and any imperfection or distortion of the bit is successively and evenly presented to all sides of the bore in the blank, the tendency of the blank is to equalize all inequalities in its grain and the tendency of the bit is to exert a uniform action on all parts of the bore in the blank.

Unseen speeds of blanks and bits if the blanks and bits should both operate at uniform speeds, corresponding portions of bit surface and periphery of bore in a blank would always coincide, and any inequalities or imperfections in bit and bore would continue, while with unequal speeds these inequalities would never coincide but new surfaces on bit and periphery of bore would oppose each other thus tending to equalize and correct all inequalities of bore.

Another advantage is that by revolving each blank against a revolving bit the resulting bores or holes are more symmetrical as the parts automatically center.

Another advantage of our construction is that we can locate one or more hollow arms or nozzles directly below the blanks and between their various stationary posit-ions connected with a source of compressed air, and arrange the valve so that just after the tools are withdrawn and the blank is moving to the next position, a powerful blast of air will be discharged into the hole thus cleaning out the chips.

In a horizontal machine, there is a tendency for all revolving and sliding parts to Wear on one side more than on the other on account of gravity whereby the accuracy is reduced and with a long slender bit, when running at high speed, there is a tendency to get out of true.

in a vertical machine, these objections are overcome, and it is also much easier to at the various parts. A vertical machine of our construction, with ez-rerything moving in circular paths in a horizontal plane, occupies much less floor space.

In the drawings, Fig. 1 is an elevation of the machine assembly with parts broken away to show construction.

Fig. 2 is a sectional elevation showing the construction of the blank magazine with the details of one set ofbobbin blank jaws or chucks and other parts.

Fig. 8 is a sectional elevation similar to Fig. 2 showing the construction of the bits or boring tools and the mechanism for driving them.

Fig. 4 is a plan view of the top of the machine.

Fig. 5 is a horizontal section looking on the line 55 of Fig. 1.

Fig. 6 is a horizontal section looking down on the line 6-6 of Fig. 1.

Fig. 7 is a horizontal section looking on the line 77 of Fig. 1.

Fig. 8 is a horizontal section looking down on the line 88 of Fig. 1.

Fig. 9 is an elevation showing a modified form of drive mechanism of the boring tools.

Where for construction reasons two parts are sweated together or otherwise held together, the cross-hatching has been continued in the same direction on both parts and the fact that they are held together is indicated by a spline.

In the drawings, A. represents the frame of a machine which is shown as including a base 1 and top 5 both of substantially triangular shape the top 5 being supported upon the three fined columns 2, 3 and l.

The motor B, shown as of the electric type and fixed to top 5, has a shaft 16 extending from the under side to a bearing 116 on down down

base A. Motor B revolves shaft 16 at high speed.

The gear 11 carried by shaft 16 meshes with intermediate gear 12 which meshes with 13, and 13 meshes with and imparts motion to the upper blank-jaw speed drive gear 14. This shaft 16 also carries a long drawn pinion 17 with which meshes and along which slides the intermediate gear 18, mounted on casing 156. Gear 18 meshes with and imparts motion to the lower tool battery ring gear 19, which it drives in the opposite direction from upper magazine drive gear 14.

Attached to the lower side of the top and concentric with a hollow column 6, is a casing which includes bearings for intermediate gears 12 and 13.

The upper or magazine driving mechanism includes a casing 21 carrying a sleeve 22 which is rotated step by step around the column 6, which extends between the top 5 and base 1, by means of the Geneva motion indicated by C.

The blank magazine is indicated by F and includes an upper series or set of jaws 27 and a lower set of jaws 30.

The upper and lower sets of jaws are aligned one above the other so that a blank T can be held between them and both are arranged on ball bearings so that they can revolve and with them the blank held between.

As shown, the lower jaw 30 is carried on a 1 guide 131 vertically slidable in brackets or ears of the casing 21 and is normally held up by a spring 132 except when it is forced down by a plow 133 fixed on column 4.

This plow is of any well known type and serves to retract the lower aw allowing the finished and bored blank to be discharged and a new blank to be inserted.

The upper jaw 27 is revoluble with a sleeve in ball bearings and this sleeve carries a jaw gear 24 which meshes with the lower blank jaw speed drive gear 23 carried by sleeve 123 which also carries and is driven by gear 14.

The parts 14, 123 and 23 revolve at a high rate of speed independently of magazine F and its component parts 21 and 22 together with the supports for the upper and lower jaws.

The Geneva motion indicated by C is given a step by step motion through a cone pulley 40 carried by sleeve 123 and belt 41 which transmits motion from pulley 40 to cone pulley 42 on shaft 142 and which in turn carries gear 242' which runs a train of gears 43, 44 and 45 and turns at a comparatively slow rate the gear 151 carrying on its shaft 251 the member 51 which at each turn moves the Geneva wheel 52 and therefore the magazine F one step, as wheel 52 is fixed to sleeve 22.

The blank magazine F is therefore turned at a comparatively low speed step by step on a vertical axis which is the center of column 6 while the jaw speed drive gear 23 is revolving each of the top jaws 27 and through each of said jaws 27 and a blank T is also revolving the corresponding lower free jaw 'at ahigh rate of speed.

The battery of boring tools represented by G includes a plurality of bits or other tools indicated by 38 each held in a chuck 39 which is carried by one of the sleeves 36 revoluble in ball bearings 37 and which carries a bit gear which engages a bit speed drive gear 34 supported in ball bearings 33, 33 and which revolves at a high rate of speed being fixed to sleeve 134 which carries lower tool battery ring drive gear 19 already described.

The battery of tools G is vertically slidable on column 6 and is caused to move up and down by the rocker arm H pivoted at one end 53 to bracket 54 and at the other end 56 to the link or connecting rod 57, which connects at its lower end to pin 58 passed through frame 156 which carries battery G. This pin slides vertically in a slot 59 through column 6. The rocker arm H, with counter weight X, has medially the pin 540 which travels in a groove 155 in a circular cam 55 carried by shaft 49 which extends from base 1 up through top 5 and carries gear 149 connected with the train of gears 43 and 44 and gear in such manner that the battery of tools moves toward and recedes from the upper magazine which is axially stationary. Bat-- tery G remains down while the magazine is being given the step by step motion in a circular path.

The gear 45 is driven from the small member of compound gear 44 and engages gear 151 which carries member 51 by which the Geneva wheel 52 is driven, and gear 45 also drives gear 149 which through shaft 49 revolves cam which through the medium of arm H raises and lowers battery G.

Gears 151 and 149 are equal to permit equal rotative speed of indexing member 51and cam shaft 49 and all parts are so timed that the tools 38 will enter the blanks, perform the work and withdraw while the magazine is stationary.

On the other hand, however, the jaw drive gears and the bit drive gears are so arranged that while the contacting surfaces of bits and blanks move in opposite directions, they move at slightly different speeds.

Another advantage of our construction is that it permits us to use a pneumatic chip cleaning system shown at W in Figs. 1, 2 and 8.

As shown, we fix on column 6, a ring 350 from which extend one or more hollow arms 351 each ending in a spout 352 in position between the bits 38 so that when the bits rise they will not be struck. From any suitable source of pneumatic pressure, we carry compressed air by means of a conductor up through column 6 into each arm and out through its spout 352.

On each arm, we locate a valve 356 having a spring handle 354 which is normally closed by spring 353 and which will return to normal after being moved out of position. In a suitable position at the bottom of the magazine F, we locate one or more trip arms 355 in such position and of such sizes that when the Geneva motion C moves the magazine F, it or they will strike one or more of the valve handles 35-1 which will be opened causing a powerful jet of air to come out through a nozzle or nozzles 352 into the hole in the bobbin as it passes, thus helping to clean out the chips and soft dust. Obviously the valves might be omitted or might be operated by hand.

For some classes of work, we may prefer to rotate the boring tools, each on its axis, by means of a second motor. In such case, we cut off shaft 16 ust below gear 11 and at the bottom use a short shaft 402 which carries long drawn gear 117 which engages l8 and is supported at the bottom on a sub-base and is revoluble in a bearing 4:00, and at the top in a bearing 403 which is carried by an arm 40.1, which also supports the separate motor l07 which by means of a shaft 408 and pulley 406 with belt 405 drives shaft 4-02 through another pulley 40% carried thereby.

l Vhatever construction is used we can, by shifting gears and pulleys in Fig. l or by changing speeds of the two motors in 9, vary the relative speed as between the revolving blanks and the revoluble boring tools.

In some cases, we may prefer to revolve the blanks at 500 R. P. M. and the tools at 5,000 B. P. M. or 6,000 R. P. M. On the other hand, if desired, we can by disconnecting the long drawn gear 117 from 18 or by stopping the motor shown. in Fig. 9, allow the bits to move up and down into the revolving blanks while the boring tools themselves are not revolving.

If it seems desirable, the blank revolving mechanism can be slowed down by suitable gearing or it can be disconnected entirely so that the blanks will not revolve, but the bits will revolve and the air jets will operate at positions between the stopping positions of the blanks on their endless path.

We claim:

1. ln a high speed multiple spindle boring machine for boring single headed wooden bobbin blanks, the combination of a work carrier supplied with a plurality of blank holding devices each adapted to revolve a blank held therein on a vertical axis; means I connected therewith for imparting to said work carrier an intermittent movement to advance the blanks successively along an end less path; with a set of boring tools each pointing upwardly in line with the axis of the work in a blank holding device; means to revolve each boring tool; and means for moving the set of boring tools upwardly into the blank holding devices while the work carrier is stationary and while the work held in each blank holding device is revolving on its axis in the opposite direction to the boring tool at their point of contact.

2. In a high speed multiple spindle boring machine for boring single headed wooden bobbin blanks, the combination of a work carrier supplied with a plurality of blank holding devices each adapted to revolve a blank held therein on a vertical axis; means connected therewith for imparting to said work carrier an intermittent movement to advance the blanks successively along an endless path; with a set of boring tools each pointing upwardly in line with the axis of the work in a blank holding device; means to revolve each boring tool; and means for moving the set of boring tools upwardly into the blank holding devices while the work carrier is stationary; together with a hollow arm connected with means for producing air pressure and terminating in a nozzle under the path of the axis of the blanks, said nozzle being located between the stationary positions of the blanks.

In a high speed multiple spindle boring macl'iine for boring single headed wooden bobbin blanks, the combination of a work carrier supplied with a plurality of blank holding devices each adapted to revolve a blank held therein on a Vertical axis; means connected. therewith for imparting to said work carrier an intermittent movement to advance the blanks successively along an endless path; with a set of boring tools each pointing upwardly in line with the aXis of the work in a blank holding device; means to revolve each boring tool; and means for moving the set of boring tools upwardly into the blank holding devices while the work carrier is stationary.

l. In a high speed multiple spindle boring machine for boring single headed wooden bobbin blanks, a set of boring tools pointing upwardly and means for revolving each tool at high speed; a corresponding set of revoluble work holding jaws; means to revolve each set of such jaws at high speed in the opposite direction to the boring tools; means for step feeding said jaws from tool to tool; and means for moving said tools upwardly, each into the axis of a revolving jaw.

In a high speed multiple spindle boring machine for boring single headed wooden bobbin blanks, a set of boring tools pointing upwardly and means for revolving each tool at high speed; a corresponding set of revoluble work holding jaws; means for step feeding said jaws from tool to tool; means for moving said tools upwardly each into the axis of a revoluble jaw; and a pneumatic nozzle positioned below the path of the jaws and between the paths of the tools.

6. In a high speed multiple spindle boring machine for boring single headed wooden bobbin blanks, a set of boring tools pointing upwardly and means for revolving each tool at high speed; a corresponding set of revoluble work holding jaws; means to revolve each set of such jaws at a different rate of speed and in the opposite direction to the boring tools; means for step feeding said jaws from tool to tool; and means for moving said tools upwardly, each into the axis of a revolving jaw.

7. In a high speed multiple spindle boring machine for boring single headed wooden bobbin blanks, he combination of a central column with a work carrier which includes an upper casing, a plurality of upper jaws each revoluble in said casing arranged 1n a ring around said column, each of said upper jaws being fixed with reference to vertical motion but each carrying a jaw gear which engages and is driven by a jaw speed drive gear, a lower casing, a plurality of lowe jaws each freely revoluble in the lower casing on an axis which passes through the centre of an upper aw and each being spring pressed upward toward an upper jaw, the lower casing being vertically adjustable towards and from the upper casing, and each lower jaw having a centrally disposed bit hole; means to move the work carrier includ ing the upper and lower jaws step by step in an endless path around said column; means to move the lower jaws up and down towards and away from the upper jaws; a plurality of spouts attached to the column in position below the lower jaws and between their stationary positions, when moving around the column, a conduit from a source of pneumatic pressure to each spout; a spring valve located in each conduit; a trip arm carried by the work carrier to open said valve when a lower aw is in position over it; and a plurality of revoluble bits adapted to move up through the lower jaws.

8. In a high speed multiple spindle boring machine for boring single headed wooden bobbin blanks, the combination of a central column; with a work carrier which includes an upper casing, a plurality of upper jaws each revoluble in said casing arranged in a ring around said column each of said upper jaws being fixed with reference to vertical motion but each carrying a aw gear which engages and is driven by a jaw speed drive gear, a lower casing, a plurality of lower jaws each freely revoluble in the lower casing on an axis which passes through the centre of an upper aw and each being spring pressed upward toward an upper jaw, the lower casing being vertically adjustable towards and from the upper casing, and each lower jaw having a centrally disposed bit hole; means to move the work carrier including the upper and lower jaws step by step in an endless path around said column; and means to move the lower jaws up and down towards and away from the upper jaws.

9. In a multiple spindle boring machine, the combination of a central column; with a work carrier supplied with a plurality of blank holding devices each adapted to revolve a blank held therein on a vertical axis; means connected therewith for imparting to said work carrier an intermittent movement to advance the blanks successively along an endless path around the column; a battery of boring tools including a frame and a plurality of boring tools each pointing upwardly and each arranged in line with the axis of the work in a blank holding device, said battery of tools being vertically slidable on said column, each boring tool being carried by a member which includes a bit gear, a bit speed drive gear which engages and revolves the bit gears, said but speed drive gear being revoluble with a ring drive gear; means to cause the battery to move up and down; a vertical battery drive shaft; suitable connections between said drive shaft and the ring drive gear whereby it will continue to drive the ring drive gear, the speed drive gear and the bit gears while the battery frame is moving up and down.

10. In a multiple spindle boring machine, the combination of a work carrier adapted to move the work from station to station while the work is held vertically and boring means at each station adapted to bore each blank from the bottom upward vertically; with a plurality of spouts each positioned between the stations and below the work, each spout connecting with a conduit from a source of pneumatic pressure; and a valve positioned in each spout; together with means to open each valve while the work is passing from one station to the next and to close each valve during the boring.

MAURICE W. HAMBLETON. BYRON F. MORRILL.

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